Use tsconfig package to parse tsconfig files

package.json

@@ -45,5 +45,8 @@
       "eslint --fix",
       "git add"
     ]
+  },
+  "dependencies": {
+    "tsconfig": "^7.0.0"
   }
 }

plugin/extract-aliases/index.js

@@ -1,11 +1,12 @@
 const fs = require('fs')
 const path = require('path')
+const { parse } = require('tsconfig')
 const normalizePluginOptions = require('../normalize-plugin-options')
 const normalizeAliases = require('./normalize-aliases')
 
 const extractAliasesFromConfig = ({ configPath, absoluteBaseUrl }) => {
-  const configFileContents = fs.readFileSync(configPath)
-  const config = JSON.parse(configFileContents)
+  const configFileContents = fs.readFileSync(configPath).toString()
+  const config = parse(configFileContents, configPath)
 
   const { compilerOptions } = config
 

plugin/pre-check/check-config-contents.js

@@ -1,3 +1,5 @@
+const { parse } = require('tsconfig')
+
 const checkConfigContents = ({
   unparsedConfig,
   configFileName,
@@ -6,7 +8,7 @@ const checkConfigContents = ({
   let config
 
   try {
-    config = JSON.parse(unparsedConfig)
+    config = parse(unparsedConfig.toString(), configFileName)
   } catch (error) {
     return handleError(
       `Cannot parse ${configFileName}. Please validate it on https://jsonformatter.curiousconcept.com.`

yarn.lock

@@ -508,6 +508,16 @@
   resolved "https://registry.npmjs.org/@types/stack-utils/-/stack-utils-1.0.1.tgz"
   integrity sha512-l42BggppR6zLmpfU6fq9HEa2oGPEI8yrSPL3GITjfRInppYFahObbIQOQK3UGxEnyQpltZLaPe75046NOZQikw==
 
+"@types/strip-bom@^3.0.0":
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/@types/strip-bom/-/strip-bom-3.0.0.tgz#14a8ec3956c2e81edb7520790aecf21c290aebd2"
+  integrity sha1-FKjsOVbC6B7bdSB5CuzyHCkK69I=
+
+"@types/[email protected]":
+  version "0.0.30"
+  resolved "https://registry.yarnpkg.com/@types/strip-json-comments/-/strip-json-comments-0.0.30.tgz#9aa30c04db212a9a0649d6ae6fd50accc40748a1"
+  integrity sha512-7NQmHra/JILCd1QqpSzl8+mJRc8ZHz3uDm8YV1Ks9IhK0epEiTw8aIErbvH9PI+6XbqhyIQy3462nEsn7UVzjQ==
+
 "@types/yargs-parser@*":
   version "20.2.0"
   resolved "https://registry.npmjs.org/@types/yargs-parser/-/yargs-parser-20.2.0.tgz"
@@ -4283,6 +4293,11 @@ strip-final-newline@^2.0.0:
   resolved "https://registry.npmjs.org/strip-final-newline/-/strip-final-newline-2.0.0.tgz"
   integrity sha512-BrpvfNAE3dcvq7ll3xVumzjKjZQ5tI1sEUIKr3Uoks0XUl45St3FlatVqef9prk4jRDzhW6WZg+3bk93y6pLjA==
 
+strip-json-comments@^2.0.0:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-2.0.1.tgz#3c531942e908c2697c0ec344858c286c7ca0a60a"
+  integrity sha1-PFMZQukIwml8DsNEhYwobHygpgo=
+
 strip-json-comments@^3.1.0, strip-json-comments@^3.1.1:
   version "3.1.1"
   resolved "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.1.1.tgz"
@@ -4416,6 +4431,16 @@ tsconfig-paths@^3.9.0:
     minimist "^1.2.0"
     strip-bom "^3.0.0"
 
+tsconfig@^7.0.0:
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/tsconfig/-/tsconfig-7.0.0.tgz#84538875a4dc216e5c4a5432b3a4dec3d54e91b7"
+  integrity sha512-vZXmzPrL+EmC4T/4rVlT2jNVMWCi/O4DIiSj3UHg1OE5kCKbk4mfrXc6dZksLgRM/TZlKnousKH9bbTazUWRRw==
+  dependencies:
+    "@types/strip-bom" "^3.0.0"
+    "@types/strip-json-comments" "0.0.30"
+    strip-bom "^3.0.0"
+    strip-json-comments "^2.0.0"
+
 tslib@^1.9.0:
   version "1.14.1"
   resolved "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz"